These problems are more important in north cold area.
此类问题在北方寒冷地区显得尤为突出。
In north cold area pavement is usually distressed because of heave factor, and the base may reduce water heave function and increase pavement service life.
北方寒冷地区路面损坏主要是由于冻胀等因素引起的，这种基层可以减小水分的冻胀作用，增加路面使用寿命。
When the influence of actual terrain considered, there is a thickening progress of the frozen layer in the north of Xuefeng mountain area with a obviously low temperature in the cold center.
当考虑真实地形影响时， 冻结层在雪峰山脉的北面存在加厚过程， 冷中心温度明显偏低；
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